138 Report on some Fishes received from Sitang River. [No. 2, 



Report on some Fishes received chiefly from the Sitang River and its 

 Tributary Streams, Tenasserim Provinces. — By Ed. Bltth. 



A Report upon fishes which I drew up some months ago has 

 gradually attained to such a length that it may be conveniently 

 divided; and I shall therefore here confine attention almost entirely 

 to fluviatile species, mostly collected by the late Major Berdmore in 

 the Sitang river and its tributaries, with a few notices of new or 

 little knowi\ species from the Gangetic streams and their outlets ; 

 reserving an extensive collection of marine fishes, collected principally 

 at Port Blair, Andaman Islands, for a future occasion. 



Fam. Jpogonidce. 

 Ambassis notattts, nobis, n. s. Nearly similar to A. lala, (Bu- 

 chanan Hamilton), in form, but as large as A. banga, (B. EL), the 

 mouth proportionally larger than in the latter and opening more 

 distinctly upwards. Diameter of the eye nearly half that of the 

 head. Body scales minute, but conspicuously visible to the unassisted 

 eye ; and the lateral line distinctly traceable throughout. In this 

 genus, the first true dorsal spine is minute and fixed, pointing forwards 

 (as in various Scomberoids), and the second or first moveable spine 

 is generally reckoned as the first. Counting the moveable species 

 only, the dorsal and anal rays are — 



D. 7— 1-13.— A. 3-14. 



The first moveable spine of the anterior dorsal fin is J the length 

 of the second, and the third is a little shorter than the second. Of 

 the anal spines, the first is but half the length of the second, which 

 again is a little shorter than the third. Fins colourless. A silvery 

 band on each flank, commencing from a large dusky humeral spot. 

 Length 2\ in. Sitang river. 



A. lala, (B. H.), var. A number of specimens of this fish sent 

 by Major Berdmore are of small size, not exceeding 1-| in. in length, 

 and have the anterior dorsal fin infuscated and the posterior dorsal 

 and anal fins margined with blackish, to an extent that I have never 

 seen in Bengal specimens ; but I can detect no difference in structure. 

 Sitang river. 



